CVE-2025-38511: 
Linux Debian vulnerability analysis and mitigation

In the Linux kernel, a vulnerability (CVE-2025-38511) has been identified related to the LMEM buffer objects and LMTT pages handling. The vulnerability was discovered and disclosed on August 16, 2025. This issue affects the Linux kernel's drm/xe/pf component (NVD).

The vulnerability stems from LMEM buffer objects not being cleared by default on allocation, and during VF provisioning, LMTT PTEs are only set up for the actually provisioned LMEM range. Beyond the valid range, stale data might remain that could point to other VFs allocations or PF pages. This creates a potential security risk where malicious VFs could exploit the gap in memory handling (NVD).

The vulnerability could potentially allow a malicious VF to access data from other VFs allocations or PF pages, leading to unauthorized access to memory contents and potential information disclosure (NVD).

The fix involves explicitly clearing all new LMTT pages to prevent potential exploitation. Additionally, asserts have been added to catch any undesired PTE overwrites, and low-level debug traces have been implemented to track LMTT PT life-cycle. The patch has been cherry-picked from commit 3fae6918a3e27cce20ded2551f863fb05d4bef8d (NVD).